The Collaborative International Dictionary of English v.0.48:
Carline thistle \Car"line this`tle\ [F. carline, It., Sp., & Pg., carlina. Said to be so called from the Emperor Charlemagne, whose army is reputed to have used it as a remedy for pestilence.] (Bot.) A prickly plant of the genus Carlina (Carlina vulgaris), found in Europe and Asia. [1913 Webster]WordNet (r) 3.0 (2006):
carline thistle n 1: a thistle of the genus Carlina